CN102509011A - Radio interference exciting functions for conductors of ultrahigh-voltage transmission line and determining method for radio interference exciting functions - Google Patents

Radio interference exciting functions for conductors of ultrahigh-voltage transmission line and determining method for radio interference exciting functions Download PDF

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Publication number
CN102509011A
CN102509011A CN2011103429566A CN201110342956A CN102509011A CN 102509011 A CN102509011 A CN 102509011A CN 2011103429566 A CN2011103429566 A CN 2011103429566A CN 201110342956 A CN201110342956 A CN 201110342956A CN 102509011 A CN102509011 A CN 102509011A
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China
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corona
radio interference
lead
conductor
voltage
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CN2011103429566A
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Chinese (zh)
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邬雄
裴春明
路遥
谢辉春
倪园
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国网电力科学研究院
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Abstract

The invention discloses radio interference exciting functions for a 10 split conductor and a 12 split conductor of an ultrahigh-voltage transmission line and a determining method for the radio interference exciting functions. The determining method for the radio interference exciting functions comprises the following steps of: through an ultrahigh-voltage corona cage test, researching corona properties of the 10 split conductor and the 12 split conductor in good weather and on heavily raining days; obtaining the corona properties of various split conductors under the two weather conditions respectively; establishing respective radio interference exciting functions of the various split conductors and altitude revision factors of the radio interference exciting functions by applying a statistic analysis method, a physical method and a mathematic method; and determining the relationship between the exciting functions and conductor structures, and the relationship between the split number and diameters of subconductors and other parameters. Proved by comparing test data, the exciting functions are suitable for characteristics of the transmission line in China and are applicable for pre-testing radio interference of the split conductors of the ultrahigh-voltage transmission line from now on so as to instruct the design of the conductor structures of an ultrahigh-voltage transmission line in the future.

Description

Leads of ultra-high voltage power transmission lines radio interference excitation function and definite method thereof

Technical field

The present invention relates to high voltage power transmission and transforming engineering electromagnetic compatibility field, particularly UHV transmission line 10 split conductors and 12 split conductor radio interference excitation functions and definite method thereof.

Background technology

Progress along with society; Net capacity day by day increases; The electric pressure of transmission line of electricity is developed to the extra-high voltage stage, and this radio interference that causes transmission line of electricity to produce is more and more stronger, makes radio interference level become one of dominance controlling factor of high voltage power transmission and transforming engineering design and construction.Therefore, setting up the radio interference level with the prediction transmission line of electricity of computation model accurately, is to guarantee that power grid construction meets national requirements for environmental protection and practices thrift the necessary condition of construction costs.

Based on the data that a large amount of corona effect tests are obtained, many countries have proposed the radio interference of suitable this country and have calculated formula.And China starts late owing to extra-high voltage; There is not the corona effect research technique; Research work mainly concentrates on the calculating of corona effect; The result who when the lead type selecting, also just calculates according to external formula selects lead division pattern, does not adapt to the radio interference calculating method of China's line feature.

The transmission line of electricity radio interference calculating method that CISPR (CISPR) is recommended is empirical method and excitation function method.Empirical method generally is used for division number and is not more than 4 circuit, and division number uses the excitation function method greater than 4 circuit recommendation.

At present, the excitation function of recommending in the CISPR18-3 publication of domestic main employing issue in 1984 calculates the radio interference level of UHV transmission line.Because the structure of test lead and production technology and existing lead was inconsistent at that time, and environmental impact factor there are differences in the process of the test, calculates so can not simply apply mechanically this excitation function.For satisfying the demand of present stage China's project of transmitting and converting electricity construction; Must carry out the corona effect experimental study of multiple fission conductor as early as possible; Lead through to a large amount of different division patterns makes an experiment; Set up and respectively divide the radio interference level of pattern lead excitation function, fill up the blank of China aspect the prediction of extra high voltage line corona effect, be China's extra-high voltage Engineering Service with accurate estimation extra high voltage line.

What deserves to be mentioned is that the excitation function of recommending in the CISPR18-3 publication does not relate to the lead of 10 divisions and 12 division patterns.Obviously, the present invention will replenish and improve the content of CISPR18-3 publication, offer reference for formulating technical standard from now on.

Summary of the invention

The objective of the invention is to overcome the deficiency of prior art and the problem of existence; Utilize the extra-high voltage corona cage; Carry out the corona characteristic research of fair weather and 10 divisions when raining heavyly and 12 split conductors; Obtain the excitation function generation of above-mentioned various split conductors respectively, use physics and mathematical method that the lot of test data are analyzed again, set up the radio interference excitation function of above-mentioned various split conductors; The altitude correcting method of said excitation function is proposed, and clear and definite said excitation function and conductor structure, the isoparametric relation of division number and sub-conductor line footpath.

To achieve these goals, the present invention includes the following step:

1, utilizes the extra-high voltage corona cage and the device of drenching with rain thereof (concrete structure of the high-voltage corona cage and the device of drenching with rain thereof sees the embodiment of back for details); Respectively 10 divisions and 12 split conductors are tested for a long time; Obtain the radio-frequency current that corona produces, when studying well weather with different radio interference levels that divide the pattern leads when raining heavyly;

2, change different altitude height test place; Respectively above-mentioned split conductor is carried out same long-term test; Obtain the radio-frequency current of the different division of Different Altitude Regions (particularly high altitude localities) pattern lead, the research sea level elevation is to the influence of split conductor radio interference level;

3, integrated use mathematics and physical method are analyzed the substantive test data, derive the excitation functions of different division pattern leads, propose the altitude correcting method of radio interference simultaneously, and controlling with electromagnetic environment for high height above sea level engineering lead type selecting provides reference;

4, utilization statistical analysis technique, the radio interference level of setting up lead and conductor structure, division number and sub-conductor line be isoparametric relation directly.And set up above-mentioned various split conductor radio interference excitation function and height above sea level correction factor thereof separately.

The present invention has the following advantages and good effect:

1. filled up both at home and abroad about division number is the blank of 10 and 12 transmission line of electricity radio interference excitation function aspect;

2. filled up domestic and international blank about regional corona effect height above sea level correction problem more than the height above sea level 3000m;

3. obtain the excitation function computation model of the various division pattern leads of suitable China line feature;

But the radio interference level of 4. said excitation function accurately predicting UHV transmission line multiple fission conductor; Be used to instruct following leads of ultra-high voltage power transmission lines structure Design; This had both guaranteed that power grid construction met national requirements for environmental protection; Practice thrift construction costs again, brought huge social and economic worth.

Description of drawings

Fig. 1 is an extra-high voltage corona cage structural representation of the present invention;

Fig. 2 connects synoptic diagram for the present invention's apparatus system hardware of drenching with rain;

Fig. 3 measures circuit theory figure for radio interference of the present invention;

Fig. 4 is a concentric conductor structural representation of the present invention;

Fig. 5 is a radio receiver signal Processing theory diagram of the present invention;

Wherein:

1-radionoise receiving trap, 1.1-radio frequency amplifier, 1.2-frequency mixer, 1.3-intermediate frequency amplifier; The 2-detector arrangement; The 3-weighting network; 4-output table meter; The control of 5-automatic gain.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed description:

1. for the corona effect of studying different division pattern leads sets up long test circuit and frequent change test lead, be unpractical economically.So the present invention utilizes the extra-high voltage corona cage, applies the corona discharge state that lower voltage reappears actual ultra-high voltage AC transmission lead, obtain the radio-frequency current of split conductor from the corona cage test.

Corona cage is placed the experiment lead usually and is come the single or multiple fission conductor in the transmission line simulation in the center.The outer wall of corona cage is the big a lot of concentric net metal cage of a radius, and the cross section is circular or square.The cage wall is used low resistance grounding through measurement.Because the close together of cage wall and lead even on lead, apply lower voltage, also can produce very high field intensity in conductive line surfaces.

Said extra-high voltage corona cage is a double-deck cage body structure (Fig. 1), and its skin is directly grounded screening cage, and internal layer is the corona measurement cage, supports with support insulator between the inside and outside layer, and inside and outside layer is all selected stainless steel or galvanized steel network for use; The extra-high voltage corona cage is divided into three sections; Interlude cage body is a measuring section; The conductive line surfaces electric field level that is in this section cage body reaches unanimity, and is used for the measurement of corona effects such as corona loss and radio interference, and respectively there are one section cage body and its insulation in the both sides of measuring section; This part is used to overcome the conductive line surfaces electric field distortion that causes owing to end effect, is called shield segment; Extra-high voltage corona cage domestic demand has the manual work device of drenching with rain, and is used to simulate different rainfall conditions, obtains the AC corona generation under the different rainy day situation; The structure of extra-high voltage corona cage also comprises support connection device, shield assembly (through the rack etc. that adds one deck gauze screen in the grounding shell outside and use shielded cable, ferrite choking coil, electromagnetic compatibility to reduce common mode interference) and wire erection device.

2. different weather is different with the influence of DC corona effect to the AC corona effect.Under the alternating voltage effect, lead is because audible noise and radio interference that corona produces will be apparently higher than fine weather in the rainy day; And direct current the reverse be true, fine weather is better than the rainy day.Therefore, when the AC extra high voltage corona cage designs, must design the device of drenching with rain (Fig. 2) that rainfall can be regulated, be used to simulate different rainy day situation.

The corona cage device of drenching with rain is made up of the VFC cabinet in the shower nozzle of drenching with rain, flow pipe road, big minor valve, filtrator, non-return valve, submersible pump and a distant place, closed-loop control module etc.Rainfall can be adjusted through valve and Frequency Converter Control, and the rainfall scope is adjustable continuously between 5-50mm/h.

3. in the extra-high voltage corona cage, adopt the conduction method to measure the radio-frequency current that the lead corona produces, promptly utilize lead over the ground coupling circuit directly measure lead with receiver because the radio-frequency current of corona generation.Its method is: directly introduce the radio interference electric current to coupling circuit from lead, C is used for isolating and exchanges or high direct voltage, measures the radio-frequency current in the coupling circuit with the radio interference receiver again.

It is as shown in Figure 4 that said electromagnetic interference (EMI) receiver signal is handled block diagram, and receiver mainly is made up of high-quality radionoise receiving trap 1, detector arrangement 2, weighting network 3, output table meter 4 and automatic gain control 5.Radionoise receives the variable band-pass filter that 1 part is a full frequency band constant gain; Detector arrangement 2 is a rectification circuit, but the modulated radio signal high fdrequency component that elimination receives obtains monolateral envelope and sends into weighting network 3; Weighting network 3 is used for confirming that indicator gauge meter 4 readings are the peak value of envelope, mean value or some middle quasi-peak value of envelope actually; Output table meter 4 is used for showing measurement numerical value; Automatic gain control 5 is used to regulate the negative feedback gain.

Said radionoise receiving trap 1 is made up of radio frequency amplifier 1.1, frequency mixer 1.2 and intermediate frequency amplifier 1.3.

4. suppose that coaxial conductor intermediate cylindrical conductor radius is r, exradius is R, represents zero potential, and is as shown in Figure 5.If radius is to be uniform-distribution with space charge on the endless face of cylinder of ρ in the coaxial configuration, unit long spacing electric density is q 0If this moment middle conductor ground connection, space charge will induce electric charge q on middle conductor, in this state, utilize Gauss theorem can obtain axial electric field to do

r < s < &rho; : E 1 = q 2 &pi; &epsiv; 0 s - - - ( 1 )

Wherein, ε 0Be permittivity of vacuum.

&rho; < s < R : E 2 = q + q 0 2 &pi; &epsiv; 0 s - - - ( 2 )

Can obtain the internal and external conductor potential difference (PD) through integration

V r - V R = &Integral; r &rho; E 1 ds + &Integral; &rho; R E 2 ds = 1 2 &pi; &epsiv; 0 [ q ln R r + q 0 ln R &rho; ] - - - ( 3 )

Because V r-V R=0, so unit head's middle conductor induced charge does

q = - q 0 ln R &rho; / ln R r - - - ( 4 )

If space charge q 0Speed with d ρ/dt is radially moved, and will cause on the conductor induced charge dq/dt that changes, the induction current that this also produces on conductor just

i = dq dt = dq d&rho; &CenterDot; d&rho; dt = 1 ln ( R / r ) &CenterDot; q 0 &rho; &CenterDot; d&rho; dt - - - ( 5 )

The capacitance per unit length of coaxial system does

C 0 = 2 &pi; &epsiv; 0 &CenterDot; 1 ln ( R / r ) - - - ( 6 )

Formula (5) substitution formula (6) is got

i = C 0 2 &pi; &epsiv; 0 &CenterDot; q 0 &rho; &CenterDot; d&rho; dt - - - ( 7 )

Find out; The space charge induction current that produces on the conductor nearby that moves is determined that by two parts item depends on the physical dimension of structure; Another depends on self-characteristics such as the space charge amount and the characteristics of motion fully, is excitation function Γ.

In the extra-high voltage corona cage, utilize the coupling circuit method to measure lead because the radio interference electric current that corona produces, this electric current was both relevant with the corona discharge self character, and was also relevant with lead, corona cage geometrical structure parameter.Suppose the corona discharge source that n independence arranged on the lead and be evenly distributed, and the radio interference electric current that each corona discharge source correspondence records is I s, the whole section lead corona radio interference electric current I of then being surveyed tFor

I t = &Sigma; k = 1 n I k 2 = n I s - - - ( 8 )

The Discrete Distribution of corona source is extended to continuous distribution, and then following formula can be converted into I t = I &CenterDot; I Or I = I i / I - - - ( 9 )

Wherein, I is the radio interference electric current that the unit long lead corona that records produces, the μ A/m of unit 1/21 is conductor length, the m of unit.

According to formula (7) and excitation function definition, it is following to obtain lead corona radio interference excitation function through the corona cage test

&Gamma; = I &CenterDot; 2 &pi; &epsiv; 0 C - - - ( 10 )

Wherein, Γ is an excitation function, and its unit is consistent with I, μ A/m 1/2C is an electric capacity between unit long lead and the corona cage, pF/m.

5. in different altitude height test place; Respectively 10 split conductors and 12 split conductors are tested for a long time; Obtain the radio-frequency current of the different division of Different Altitude Regions (particularly high altitude localities) pattern lead, the quantitative test sea level elevation is to the influence of split conductor corona characteristic.

6. according to the substantive test data, set up the excitation function of different division pattern leads, propose the altitude correcting method of radio interference simultaneously.

7. use statistical analysis technique, set up radio interference level and division number, sub-conductor line footpath and the isoparametric relation of heading spacing of lead.

The content of not doing in this instructions to describe in detail belongs to this area professional and technical personnel's known prior art.

Claims (3)

1. an extra-high voltage 10 divides and 12 split conductor radio interference excitation functions and definite methods thereof; Comprise and utilize extra-high voltage corona cage test figure; Set up the radio interference excitation function of various division pattern leads; And the altitude correcting method of radio interference and the relation of radio interference level and conductor structure, division number and sub-conductor line footpath parameter are proposed, its method is:
Utilize the test of extra-high voltage corona cage, study well the corona characteristic of weather and 10 divisions when raining heavyly and 12 split conductors, obtain the radio-frequency current of each split conductor under above-mentioned two kinds of situation respectively;
To the great number tested data analytic statistics, set up above-mentioned various split conductor radio interference excitation function separately again;
Change the different altitude height place and carry out the corona cage test, respectively above-mentioned split conductor is carried out same long-term test, obtain the radio-frequency current of the different division of Different Altitude Regions pattern lead, the research sea level elevation is to the influence of split conductor radio interference level;
Analyze the substantive test data, set up the excitation function of different division pattern leads, propose the altitude correcting method of radio interference simultaneously;
The utilization statistical analysis technique, the relation in the radio interference level of setting up lead and conductor structure, division number, sub-conductor line footpath, thereby the radio interference of definite multiple fission conductor.
2. extra-high voltage 10 division and 12 split conductor radio interference excitation functions and definite methods thereof as claimed in claim 1; It is characterized in that: extra-high voltage 10 division and the 12 split conductor radio interference excitation function height above sea level correction factor and the methods thereof in the above area of height above sea level 3000m; Its method is: carry out regional corona cage test more than the 3000m; Obtain the corresponding relation of sea level elevation and corona effect, confirm corresponding height above sea level correction factor.
3. extra-high voltage 10 division and 12 split conductor radio interference excitation functions and definite methods thereof as claimed in claim 1, it is characterized in that: said method is specially:
1. utilize the extra-high voltage corona cage; Corona cage is placed the experiment lead and is come the single or multiple fission conductor in the transmission line simulation in the center; The outer wall of corona cage is the big a lot of concentric net metal cage of a radius, and the cross section is circular or square, and the cage wall is used low resistance grounding through measuring; Apply the corona discharge state that lower voltage reappears actual ultra-high voltage AC transmission lead, obtain the radio-frequency current of split conductor from the corona cage test;
2. be provided with the device of drenching with rain that rainfall can be regulated in the AC extra high voltage corona cage; Be used to simulate different rainy day situation; The said corona cage device of drenching with rain is made up of the VFC cabinet in the shower nozzle of drenching with rain, flow pipe road, big minor valve, filtrator, non-return valve, submersible pump and a distant place, closed-loop control module etc.; Rainfall is adjusted through valve and Frequency Converter Control, and the rainfall scope is adjustable continuously between 5-50mm/h;
3. in the extra-high voltage corona cage, adopt the conduction method to measure the radio-frequency current that the lead corona produces, promptly utilize lead over the ground coupling circuit directly measure lead with receiver because the radio-frequency current of corona generation; Its method is: directly introduce the radio interference electric current to coupling circuit from lead, capacitor C is used for isolating and exchanges or high direct voltage, measures the radio-frequency current in the coupling circuit with the radio interference receiver again;
4. in the extra-high voltage corona cage, utilize the coupling circuit method to measure lead because the radio interference electric current that corona produces, this electric current was both relevant with the corona discharge self character, and was also relevant with lead, corona cage geometrical structure parameter; Set the corona discharge source that n independence is arranged and be evenly distributed on the lead, and the radio interference electric current that each corona discharge source correspondence records is I s, the whole section lead corona radio interference electric current I of then being surveyed tFor
I t = &Sigma; k = 1 n I k 2 = n I s
The Discrete Distribution of corona source is extended to continuous distribution, and then following formula can be converted into I t = I &CenterDot; I Or I = I i / I
Wherein, I is the radio interference electric current that the unit long lead corona that records produces, and unit is μ A/m 1/2I is a conductor length, and unit is m;
It is following to obtain lead corona radio interference excitation function through the corona cage test
&Gamma; = I &CenterDot; 2 &pi; &epsiv; 0 C
Wherein, Γ is an excitation function, and its unit is μ A/m 1/2, C is an electric capacity between unit long lead and the corona cage, unit is pF/m;
5. in different altitude height test place, respectively 10 split conductors and 12 split conductors are tested for a long time, obtained the radio-frequency current of the different division of Different Altitude Regions pattern lead, the quantitative test sea level elevation is to the influence of split conductor corona characteristic;
6. according to the substantive test data, set up the excitation function of different division pattern leads, propose the altitude correcting method of radio interference simultaneously;
7. use statistical analysis technique, set up the radio interference level of lead and the relation of division number, sub-conductor line footpath and heading spacing parameter, thereby confirm the radio interference of multiple fission conductor.
CN2011103429566A 2011-11-03 2011-11-03 Radio interference exciting functions for conductors of ultrahigh-voltage transmission line and determining method for radio interference exciting functions CN102509011A (en)

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CN102997990B (en) * 2012-12-18 2015-12-23 中国电力科学研究院 Transmission line of electricity audible noise and radio interference long-term measurement system and measuring method
CN105403775A (en) * 2014-08-14 2016-03-16 国家电网公司 Differential method for determining radio interference in EHV (extra-high voltage) AC single-circuit power transmission line
CN105447289A (en) * 2014-08-14 2016-03-30 国家电网公司 Method for determining hearable noise corrected value of extra-high voltage single circuits
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CN104182628A (en) * 2014-08-18 2014-12-03 国家电网公司 Radio jamming standing wave analysis method of ultra-high-voltage alternating-current testing line
CN104715151A (en) * 2015-03-20 2015-06-17 国家电网公司 High-voltage transmission line radio interference excitation function determination method
CN104715151B (en) * 2015-03-20 2018-03-20 国家电网公司 A kind of ultra-high-tension power transmission line radio interference excitation function determines method
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CN105486961B (en) * 2016-01-23 2018-04-27 清华大学 DC power transmission line radio interference excitation function test method based on corona cage
CN105486961A (en) * 2016-01-23 2016-04-13 清华大学 Direct-current power transmission line radio interference excitation function testing method based on corona cage
CN108037383A (en) * 2017-11-28 2018-05-15 南方电网科学研究院有限责任公司 Pipe busbar radio interference test system, calibration system and test method, calibration method
CN108205088A (en) * 2017-12-25 2018-06-26 重庆大学 A kind of parallel radio interference of high voltage ac/dc circuit calculates and optimization method
CN110082621A (en) * 2019-05-07 2019-08-02 北京航空航天大学 A kind of radio interference indirect gain method
CN110082621B (en) * 2019-05-07 2020-09-08 北京航空航天大学 Radio interference indirect acquisition method
CN110456176A (en) * 2019-05-28 2019-11-15 武汉大学 A kind of calculation method of high altitude localities ultra-high-tension power transmission line radio interference level

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Application publication date: 20120620